LatinIME: Enable more keys for top row on tablets

 * Enable long-press for numbers on the top row.

Change-Id: I6e174bf90fa8c19035c40f12f8bfcbb09c9b8624
LatinIME: no default sounds for tablets

Change-Id: Icb02ae3d489c480531d907176ba8011621a247f9